Manachino calotta blu

Identificazione

Blue-capped manakins show sexual dimorphism in weight and wing chord length. Females are heavier at 9.8 g on average with a max weight of 11.5 g and a minimum weight of 8.5 g. Males are 8.5 g on average with a maximum weight of 9.5 g and a minimum weight of 7.5 g. Males have a wing chord length of 60.45 mm on average with a maximum length of 63 mm and a minimum length of 58 mm. Females have a wing chord length of 58.76 mm on average with a maximum length of 62 mm and a minimum length of 55 mm.<p>Males are sooty black with a bright blue crown while females are green. Juvenile plumage is similar to female plumage but is duller in color. Their first prebasic molt occurs within 2 months of leaving the nest and is a partial molt. Their second prebasic molt occurs at the end of the first breeding season or one year after their first prebasic molt. This molt is complete, so they lose their molt limits. At this stage, males gain signs of male plumage. The third prebasic molt occurs at the end of their third year and males gain full male plumage.<p>The blue-capped manakin's contact call is a swee sound. It is used by blue-capped manakins of all ages and sex. Males will use it while perching on their song perch, while interacting with other blue-crowned manakins, and while performing some of their display behaviors. Females and fledglings use a soft swee sound during foraging. Adult females will also use this call when visiting a territorial male. Their contact call can be a single note or in bouts of a varying number of repetitions. It is a high pitch note that increases in pitch from 2.8 to 5.7 kHz. Territorial males use an advertisement call that sounds like chi-wrr. It can be a single note or 3-5 repetitions. This call is composed of three parts. First, a lower pitched swee sound of 3–5 kHz. Second, a short descending note of three stacked harmonics or 1.4, 2.8, and 4.8 kHz. Third, a harsh note of two harmonics of 2.0 and 3.9 kHz. Males make a preew call when interacting with males and females in their territory. It is composed of 4-5 rapid oscillations between 3.1 and 6 kHz. During display, males make a pee call of 1-10 repetitions. It consists of both flat notes and harmonics between 1.5 and 15 kHz.

Tassonomia

The blue-capped manakin was formally described in 1825 by the German naturalist Johann Baptist von Spix under the binomial name Pipra coronata. The type locality is the state of São Paulo de Olivença in western Brazil. The specific epithet is from Latin coronatus meaning "crowned". The blue-capped manakin is now the type species of the genus Lepidothrix that was introduced by the French naturalist Charles Lucien Bonaparte in 1854.<p>Phylogeny based on Ohlson et al. 2013.<p>Six subspecies are recognised, but see the text below the table.<p>(Spix, 1825)<p>(Meyer de Schauensee, 1953)<p>(Todd, 1925)<p>(Hellmayr, 1905)<p>(Goeldi, 1905)<p>(J. Bond &amp; Meyer de Schauensee, 1940)<p>With the exception of L. c. carbonata, the subspecies categories listed above are not supported phylogenetically. They were instead named based on differences in male plumage. Blue-capped manakins differ genetically into six clades based on geographic location: trans-Andean, Venezuela, North Amazon, Napo-Marañon, Central Peru, and South Peru/Bolivia. Interestingly, birds of highly different plumage fall into the same clades. For example, L. c. exquisita, which has green plumage males, and L. c. coronata, which has completely black colored males, both fall into the Central Peru clade. <p>Based on significant vocal and phylogenetic differences, in July 2022 the South American Classification Committee of the American Ornithological Society split L. c. velutina and L. c. minuscula from L. coronata and named the resulting L. velutina the velvety manakin. They also renamed the now-reduced L. carbonata "blue-capped manakin" to avoid confusion with the pre-split species. The velvety manakin was therefore promoted to species status and the "blue-crowned manakin" renamed to the blue-capped manakin.<p>Blue-capped manakins vary genetically based on geographic location. Physical boundaries, such as large Amazonian rivers and the Andes Mountains, tend to separate genetically distinct blue-capped manakins. The uplift of the Andes Mountains seem to be the first major source of separation between blue-capped manakin populations followed by the establishment of Amazonian rivers. The Amazon River separates North and South Amazonian clades and the Napo River separates the North Amazon and Napo-Marañon clades. Large rivers present a barrier to Blue-crowned manakins despite being flighted because they prefer the understory of terra firme (non-flooded) forests. Central Peru and South Peru/Bolivia clades and Venezuela and Amazonia clades are not separated by a geographic barrier. It is likely that they instead historically separated and evolved separately for a period of time.

Nome scientifico

Lepidothrix coronata

Autorità

(Spix, 1825)

Ordine

Non una specie riconosciuta

Famiglia

Pipridae

Genere

Lepidothrix

Areale e habitat

Blue-capped manakins live in terra firme forest understory of South America.

Migrazione

Resident species

Comportamento

Breeding season coincides with the dry season (late November to early April). Males are known to display alone or form leks of up to seven males. Adult and juvenile males form territories though juveniles are unable to maintain their own territory. Their territories range from 206 to 5045 m² in size. They defend their territory and attract mates through song. They perform their songs on song perches that are horizontal or slightly angled twigs and will sing between 6am and 5pm. Their display courts are 3–5 m in diameter and are located close to the ground in the open understory. They use up to two courts at a time, but courts can change location annually. Their courtship displays are somewhat complex with a total of 11 behaviors, 6 of which are aerial. Female's home ranges average 4 ha in size and overlap with one lek on average.<p>Blue-capped manakins make simple, open-cup nests using dry palm, dry leaves, and/or bark externally. The internal lining of their nest is pale brown, but can also be whitish or yellow. They use spider webs to secure their nests to the tree. They chose small shrubs and treelets that are less than 1 meter tall and place their nests on horizontal forks. They typically nest in Rudgea spp., Ixora killipii, R. viridifoliax, and R. lindenicana along small ravines. Females are the sole nest builders and take care of their offspring alone. They lay two eggs per clutch. Their nests experience high predation rates. To help mitigate this risk, Blue-crowned manakins choose nesting sites away from wire-tailed manakins, a species that favors similar nesting environments. This reduces the number of birds nesting in one area and thus reduces the chance that predators will predate the area.<p>Blue-capped manakins are frugivores. Their diet includes fruit from Melastomataceae, Moraceae, Bromeliaceae, and Araceae.<p>When feeding in a mixed flock, blue-capped manakins tend to flock with cinereus and dusty-throated antshrikes, and the white-flanked, Yasuni, long-winged, gray, and rufous-tailed stipplethroats. These flocks are typically only composed of one or two blue-capped manakins. When there are two blue-capped manakins in a flock, they forage independently from one another. Their behavior is never aggressive toward other species of birds in the flock. Both males and females forage in mixed flocks, but females spend more time on average in the flock. They forage in the understory between a height of 2–7 m. Their preferred food while in flocks are arthropods, including ants, flies, and other small insects. While catching arthropods, their hunting technique was often a sally-strike or sally-glean off of live foliage. Considering their normally frugivorous diet, it is speculated that the blue-capped manakins are taking advantage of the flock's ability to cause insects to scatter.

Conservazione

Tendenza della popolazione

declining